[clang] [CIR] Add emitDeclInvariant for global with constant storage (PR #171915)

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adams381 wrote:

Addressed parameter naming compliance issue: Changed function parameters in `emitInvariantStart` from PascalCase (`Size`, `Addr`) to lowercase camelCase (`size`, `addr`) to match LLVM coding standards for function parameters. This ensures consistency with the rest of the codebase where function parameters use lowercase camelCase naming convention.

https://github.com/llvm/llvm-project/pull/171915